40188138 has 16 divisors (see below), whose sum is σ = 80465376. Its totient is φ = 13381200.

The previous prime is 40188133. The next prime is 40188157. The reversal of 40188138 is 83188104.

It is a happy number.

40188138 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 40188099 and 40188108.

It is not an unprimeable number, because it can be changed into a prime (40188133) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3120 + ... + 9492.

It is an arithmetic number, because the mean of its divisors is an integer number (5029086).

Almost surely, 2^40188138 is an apocalyptic number.

40188138 is an abundant number, since it is smaller than the sum of its proper divisors (40277238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40188138 is a wasteful number, since it uses less digits than its factorization.

40188138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7429.

The product of its (nonzero) digits is 6144, while the sum is 33.

The square root of 40188138 is about 6339.4114868811. The cubic root of 40188138 is about 342.5305366419.

The spelling of 40188138 in words is "forty million, one hundred eighty-eight thousand, one hundred thirty-eight".